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The modules are loaded by Olimex with one of their demo programs. It doesn't run the AT stack you want. If you want to work with AT commands, you will have to load the AT image. There are documents and images at Espressif on GitHub to do this.

Dear all, I'm a beginner for using ESP8266 wifi module. while connecting this wifi module with usb serial converter to PC i can't able to communicate with it like when i send "AT" to it i can't get anything back from wifi. Its crystal frequency is 26Mhz and default flash mode. When swapping the tx and rx lines then getting the below information from that.à ets Jan 8 2013,rst cause:1, boot mode:(3,6)